Well, I proposed the establishment of British security controls on British aircraft and shipping in US ports right here on the blog not so long ago, in response to the regular US-inspired security scares. But it seems to have become US policy to do the opposite - to send (I suppose) agents from the failed TSA to major airports outside the US. Like Heathrow. Here's the link
The obvious objection is that this way madness lies - will every major airport soon be a weird multinational broth of policemen? And, of course, I objected to the sky marshals on those grounds among others. Here's the problem - this will eventually happen if there is no confidence in land-side states' efforts (or indeed good faith) and continued alerts, because things will get intolerable.